例子：设置 name 缓存 10 秒

redisTemplate.opsForValue().set("name","neo",10, TimeUnit.SECONDS);
redisTemplate.opsForValue().get("name")

结果：由于设置的是10秒失效，十秒之内查询有结果，十秒之后返回为null			
			
			

			
stringRedisTemplate.opsForValue().set("test", "100");							//向redis里存入数据			
stringRedisTemplate.boundValueOps("test").increment(-50);						//val做-60操作
stringRedisTemplate.boundValueOps("test").increment(100);						//val +100
stringRedisTemplate.opsForValue().get("test")									//根据key获取缓存中的val		
			
			

		
	private void cleanNewToday() {
		long begin = System.currentTimeMillis();
        
		redisTemplate.delete("news:today");
    
        long end = System.currentTimeMillis();
		logger.info("Schedule clean redis {} 耗时 {} 秒", "cleanNewFlash()", (end-begin) / 1000 );
	}
		
			

			
    @SneakyThrows
    public Optional<Set<String>> anyCache1(String prefix, String key, Supplier<Optional<Set<String>>> supplier) {
        // RedisTemplate redisTemplate = new RedisTemplate();
        Set<String> value;
        if (redisTemplate == null) {
            value = supplier.get().get();
            this.log("Cache Skip Key: " + key + " Value: " + value);
        } else {
            String digest = DatatypeConverter.printHexBinary(MessageDigest.getInstance("MD5").digest(key.getBytes(StandardCharsets.UTF_8)));
            key = String.format("aigc:%s:%s", prefix, digest);

            if (redisTemplate.hasKey(key)) {
                value = (Set<String>) redisTemplate.opsForValue().get(key);
                this.log("Cache Hit Key: " + key + " Value: " + value);

            } else {
                value = supplier.get().get();
                redisTemplate.opsForValue().set(key, value);
                this.log("Cache Set Key: " + key + " Value: " + value);
            }
        }
        return Optional.of(value);
    }			
			
			

			
    @Autowired
    private RedisTemplate<String, String> redisTemplate;
    
    Long ttl = redisTemplate.getExpire(String.format("lock:%s", device));			
			
			

Spring Redis 中设置过期时间方法如下

		
设置 key
redisTemplate.opsForValue().setIfAbsent("key", "value");
设置过期时间
redisTemplate.expire("key", 30000, TimeUnit.MILLISECONDS);
释放 key
redisTemplate.delete("key");		
		
			

这样存在一个问题，当程序运行一半被强行终止，可能导致setIfAbsent运行完成，但是expire未被执行，这样 key 便永远不会释放。解决方案如下，使用RedisCallback执行原生 Redis 命令。

		
String result = redisTemplate.execute(new RedisCallback<String>() {
	@Override
	public String doInRedis(RedisConnection connection) throws DataAccessException {
		JedisCommands commands = (JedisCommands) connection.getNativeConnection();
		return commands.set(key, value, "NX", "PX", expire);
	}
});